Frame for butchers&#39; saws.



No. 650,913. Patented June 5, I900. A. 0. SAXTON.

FRAME FOB BUTCHERS SAWS.

(Application filed Aug. 10, 1899.)

2 Sheets-Shea! I (No Model.)

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No. 650,9l3.

Patented June 5, I900.

A. c. SAXTON. FRAME FOB. B UTCHERS SAWS.

(Application filed Aug. 10, 1899.)

2 Shear-Sheet 2 (No Model.)

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Witnesses ,NITED STATES PATENT OFFI E.

AUGUSTUS c. SAXTON, OF NEW YORK, N. Y., ASSIGNOR TO DANIEL w. MARTIN, OF SAME PLACE.

FRAME FOR BUTCHERS SAWS.

SPECIFICATION forming part of Letters Patent No. 650,913, dated June 5, 1900.

Application filed August 10, 1899. $erlal No. 726,762. (No model.)

To all whom it may concern:

Beit known that I, AUGUSTUS 0. Sutton, a citizen of the United States, residingin the borough of Brooklyn, city of New York, State of New York, have invented certain Improvements in Frames for Butchers Saws,of which the following is a specification.

Figure 1 illustrates an elevation of the invention. Fig. 2 illustrates a View, partly in section, of the parts at the handle end of the frame, whereby tension is given to the saw, the grip being closed. Fig. 3 illustrates an elevation of the parts at the farther end of the saw-frame, the grip being open. Fig. 4 illustrates a horizontal sectional view on the lines Y Y of the parts shown in Fig. 2, the grip being open. Fig. 5 illustratesa horizontal sectional View of the parts shown in Fig. 3 on the line to 0c of that figure, excepting that the flap-piece of the grip is not thrown quite so far back as in that figure. Fig. 6 illustrates a front edge view of the grip-piece shown in Figs. 2 and 4. Fig. 7 illustrates in elevation a saw and frame embodying a modified construction of the invention. Fig. 8 illustrates in elevation a View of the grip and tension devices at the handle. end of the frame shown in Fig. 7. Fig. 9 illustrates in elevation a View of the grip device at the farther end of the frame shown in Fig. 7. Fig. 10 illustrates a horizontal section on the line Z Z of Fig. 8 of the parts shown in that figure. Fig. 11 illustrates a horizontal sectional view on the line X X of Fig. 9 of the parts shown in that figure. Fig. 12 illustrates an edgewise view of the grip device shown in Fig. 7 at the end of the frame farthest from the handle.

Referring first to Figs. 1 to 6, A is the handle, and B the frame. 0 is an enlarged eyeshaped part of the frame, which is bored centrally. D is a threaded thumb-screw. E is a clamp-piece provided with a threaded stem F, which is adapted to longitudinal movement through the eye 0. At the forward end of the piece E there are two undercut blocks G G, and the central part of the piece E is cut away and provided with a dovetail slideway H. (See Fig. 6.) In this slideway the grip proper works. It is composed of two pieces I and I, hinged together at K. The part Iis dovetailed to slide in the slideway H, and on the part I there is a pin L, which passes through a hole made in the end of the saw, whereby it is held. At the other end of the saw-frame there is a somewhat-similar gripping device-that is to say, the frame at this end is bifurcated, as shown in Figs. 1 and 5, and a section of one of the halves is cut away at the rear, but a portion of that half is left, as seen at, N, which is undercut in an inclined fashion, as shown. The grip device at this end of the frame is likewise composed of two parts 0 and O, hinged together at P. Q is a pin set rigidly in the part 0, and R is a recess to receive the end of the pin made in the part 0. The frame is cut away somewhat, as seen at S, to afford space for the headed end of the pin to move in and yet the grip be confined against dropping away from the frame. The front edge of the swinging part 0 of the gripis beveled oif to adapt it to engage with the inwardlyinclined surface of the part N in such mannor as to secure surfaces welladapted to slide over each other, and this same construction is present in the parts of the front corners of the swinging part I which engage with the undercut blocks G G and for the same purpose.

The operation is as follows: The grip at the farther end of the frame is first pushed outwardly, the end of the pin Q moving through the recess S in the frame until the swinging part 0 will clear the cross-piece N. Then it is swung outwardly, as shown in Fig. 5. The saw-blade is then passed in through the slit between the part N and the other part of the frame and the hole in the end of the saw is passed over the pin Q. The part 0' is then swung back again and the saw-blade is pulled forwardly until the inclined edge of the part 0' passes beneath the cross-bar N. The other end of the saw-blade is then in like manner engaged with the grip at the opposite or handle end of the frame-that is to say, the thumb-nutis turned back, so as to project the clamp-piece E. Then the grip I and I is moved backwardly in the slideway in E until the corners of the swinging part I are free from the undercut blocks G G on E and it is then swung outwardly, as shown in Fig. 4.

The saw-blade is then passed over the pin and the swinging part I closed down again over the pin, thus securing the saw-blade. Then the thumb-screw is screwed up, and as the tension is applied the gripI and I, being held by the saw, is at first immovable, or practically so, because of which the beveled corners of the part I pass under and are clamped by the undercut blocks G G on the part E. Thus as the strain increases the ends of the saw are held by the peculiar construction and operation of the interlocking parts at the two ends of the saw with greater and greater rigidity.

The modified construction shown in Figs. 7 to 12, inclusive, is the same in general principle as that just described, but differs in detailsthat is to say, in both forms the strain of the saw when put under tension is applied directly to movable gripping devices which are provided with inclined surfaces adapted to engage with like surfaces on the saw-frame in such manner as to secure tighter and tighter gripping and holding of the saw-blade as the strain is increased. In this construction 1 is thehandle; 2, the frame; 3, the eyeshaped enlargement near the handle; 4, the clamp piece with its threaded spindle 5,

adapted to receive a nut 6 or thumb-screw,

as preferred. 7 is a spline to prevent turning of the clamp. The latter is, roughly, in the form of the letter T, and the face of the cross-bar of the T is cut out or recessed, as shown at 8 S, the edges of the recess being inclined from the front rearwardly and also undercut, so as to form diverging and at the same time dovetail surfaces. 9 is a plate havinga pin 10 set about centrally in it, and its edges are formed on the same duplex angles as above described, so that they will engage with and be locked by their engagement with the edges of the recess in the clamp-piece. 11 is a recess cut in the clamppiece deep and wide enough to permit space for the end of the pin 10, which in order to afford a good hold for the saw-blade I prefer should have a projection of about an eighth of an inch. The grip device at the opposite end of the frame is in all respects a duplicate of that just described, excepting that the plate 12, which is provided with the pin 13 and diverging and inclined edges, is received by and held in a recess H made in the end 15 of the frame itself.

The operation is obvious. The pin 13 of the plate 12 is passed through a hole made in the end of the saw-blade, and the plate 12 is then placed in the recess made for it in the frame and pressed forwardly through that recess until the edges of the plate engage with ant jam against the inclined and undercut edges of the recess. Then the pin 10 on the other plate 9 is passed through the hole in the other end of the saw, and the nut G (or thumb-screw, as the case may be) is loosened, so that the plate 9 can be placed in the recess made in the face of the clamp-piece 4. Therenpon the nut or thumb-screw is screwed up until the edges of the plate 9 interlock with the edges of the said recess. Thereupon as the strain is increased the two plates are e11- gaged more and more firmly and the sawblade held more and more rigidly by reason of the tighter and tighter grip of theinclined and beveled edges of the plates against and within the corresponding edges of the recesses within which they are held respectively.

It will be seen that by my invention several advantages are secured, among them the followingt'. e., the greater the strain the tighter the saw is held, no projecting pins or like devices to catch in the clothing of the user or, perhaps, hurt his hands, smooth surfaces which can be readily cleaned, and also quick and easy adjustment of the saw within the frame.

It will be obvious to those who are familiar with this art that various changes may be made in the details of construction of the parts without departing from the essentials of the invention. I therefore do not limit myself to such details.

I claim- 1. In a saw-frame the combination of a screw-threaded spindle provided with a nut and having a transverse orT-shaped portion at its end opposite the nut, a recess within said transverse portion, the ends of which recess are undercut and also tapered from the nut forwardly, another recess on the outer end of the saw-frame the ends whereof are also undercut and tapered toward the handle of the saw, movable sawholding devices adapted to be engaged with the respective ends of the saw-blade, said devices having beveled and inclined edges corresponding with the said undercut and tapered recesses on the spindle and saw-frame respectively, for the purposes set forth.

2. In a saw-frame the combination of a screw-threaded spindle provided with a nut, movable saw-holding devices each made of two parts hinged together and having a pin projecting between them adapted to engage with holes in the respective ends of the saw, and interlocking surfaces on the spindle and on the saw-frame adapted to engage with like surfaces on the saw-holdin g devices when the hinged parts are folded together in such manner that the greater the strain on the saw the tighter the hinged devices will be closed upon the saw and held in place for the purposes set forth.

AUGUSTUS C. SAXTON.

lVitncsses:

PHILLIPS ABBOTT, EDGAR R. MEAD. 

